[PATCH v6 07/15] platform/x86: int3472: Enable I2c daisy chain

[Hans de Goede <hdegoede@redhat.com>]

From: Daniel Scally <djrscally@gmail.com>

The TPS68470 PMIC has an I2C passthrough mode through which I2C traffic
can be forwarded to a device connected to the PMIC as though it were
connected directly to the system bus. Enable this mode when the chip
is initialised.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
 .../x86/intel/int3472/intel_skl_int3472_tps68470.c         | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/intel_skl_int3472_tps68470.c b/drivers/platform/x86/intel/int3472/intel_skl_int3472_tps68470.c
index c05b4cf502fe..42e688f4cad4 100644
--- a/drivers/platform/x86/intel/int3472/intel_skl_int3472_tps68470.c
+++ b/drivers/platform/x86/intel/int3472/intel_skl_int3472_tps68470.c
@@ -45,6 +45,13 @@ static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
 		return ret;
 	}
 
+	/* Enable I2C daisy chain */
+	ret = regmap_write(regmap, TPS68470_REG_S_I2C_CTL, 0x03);
+	if (ret) {
+		dev_err(dev, "Failed to enable i2c daisy chain\n");
+		return ret;
+	}
+
 	dev_info(dev, "TPS68470 REVID: 0x%02x\n", version);
 
 	return 0;
-- 
2.33.1